Etiology
The development of asthma involves interplay between host factors (particularly genetics) and environmental exposures that occur at a crucial time in the development of immune system.
•Innate Immunity: The hygiene hypothesis suggests that certain infections early in life, exposure to other children (e.g.: presence of older siblings and early enrolment of children in childcare, which have a greater likelihood of exposure to respiratory infection), less frequent use of antibiotics, and country living are associated with a TH1 response and lower incidence of asthma, whereas the absence of these factors is associated with a persistent TH2 response and higher rates of asthma.
•Genetics: Asthma has an inheritable component, but the genetics involved remain complex.
•Environmental factors: Two major factors are the most important in the development, persistence, and possibly the severity of asthma: airborne allergens, particularly sensitization and exposure to house dust mite and Alternaria (a type of mold, common allergen grows indoors and causes hypersensitivity reactions) and viral respiratory infections.
EtiologyThe development of asthma involves interplay between host factors (particularly genetics) and environmental exposures that occur at a crucial time in the development of immune system.•Innate Immunity: The hygiene hypothesis suggests that certain infections early in life, exposure to other children (e.g.: presence of older siblings and early enrolment of children in childcare, which have a greater likelihood of exposure to respiratory infection), less frequent use of antibiotics, and country living are associated with a TH1 response and lower incidence of asthma, whereas the absence of these factors is associated with a persistent TH2 response and higher rates of asthma.•Genetics: Asthma has an inheritable component, but the genetics involved remain complex.•Environmental factors: Two major factors are the most important in the development, persistence, and possibly the severity of asthma: airborne allergens, particularly sensitization and exposure to house dust mite and Alternaria (a type of mold, common allergen grows indoors and causes hypersensitivity reactions) and viral respiratory infections.
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